| 摘要 |
A trigger device for setting a downhole tool is disclosed. The trigger de vice includes a retaining member that prevents the downhole tool from settin g until it is properly positioned within the well. Regardless of the type of downhole tool or the type of trigger device, the retaining member includes a dissolvable material that dissolves when contacted by a solvent. The disso lvable material is preferably one that dissolves at a known rate so that the amount of time necessary for the downhole tool to set is pre-determined. Pr eferably, the solvent is a water- based or hydrocarbon-based drilling fluid or mud.
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